Removed workaround for unspecified build problem on MinGW.
Removed workaround for unspecified build problem on MinGW.

Tested that MinGW/MSYS builds fine without that.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@128341 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang